CN211727692U

CN211727692U - Portable hydraulic tool

Info

Publication number: CN211727692U
Application number: CN202020171528.6U
Authority: CN
Inventors: 杨鹏举
Original assignee: Suzhou Daojian Precision Technology Co ltd
Current assignee: Suzhou Daojian Precision Technology Co ltd
Priority date: 2020-02-15
Filing date: 2020-02-15
Publication date: 2020-10-23
Anticipated expiration: 2030-02-15

Abstract

The application provides a portable hydraulic tool, which comprises a shell, a handle and a battery pack, wherein one side end of the shell is provided with the handle; the handle is provided with a switch for driving the hydraulic tool, the shell is internally provided with an actuating mechanism which is detachably connected with a working assembly for operation, and the actuating mechanism comprises a pressure relief valve assembly and an auxiliary pressure relief assembly which is matched and connected with the pressure relief valve assembly and is used for restoring a moving part of the working assembly to an initial position or a middle position in a stroke. The hydraulic tool has the advantages that the working efficiency of the hydraulic tool is improved, the retraction time of a piston (an actuating mechanism) during working can be greatly shortened during application, the hydraulic tool can be stopped at a certain position in a stroke, the switch piston is closed to automatically retract when the working is finished, and therefore the time for moving the piston during next working is saved, and the working (such as shearing) efficiency is improved.

Description

Portable hydraulic tool

Technical Field

The utility model relates to a hydraulic tool technical field specifically relates to a portable hydraulic tool.

Background

Hydraulic tools are widely used in production activities and are divided into the following according to their use: hydraulic nut breaks cutter, hydraulic pressure cutter etc. it has high-efficient, convenient advantage. The hydraulic tool is provided with a one-way valve, when the tool works, a medium stored in an oil storage cavity is pumped out and flows based on the driving of a driving motor, the one-way valve is opened after the medium (hydraulic oil) reaches a preset pressure, moves to a valve opening position and is kept at the valve opening position, and the medium flows into a cavity of a working area to push a piston to move for working. When the shearing or breaking operation is finished, the internal pressure of the system does not reach the set pressure, the pressure relief button needs to be pressed at the moment, or the switch assembly continues to be pressed until the internal pressure of the system reaches the set pressure), the oil drainage hole of the pressure relief assembly is opened, and at the moment, the medium in the cavity of the working area is returned to the oil storage cavity under the action of the spring. The work is thus performed reciprocally. The existing hydraulic tool has the defects that the structure that the medium in the cavity of the working area is returned to the oil storage cavity is complex, the oil return speed is slow, and the next operation is carried out by mostly adopting a mode of returning to the initial position, so that the running efficiency of the tool is not high.

Therefore, a new hydraulic tool is needed.

SUMMERY OF THE UTILITY MODEL

Based on the above problem, the utility model provides a portable hydraulic tool to solve the problem that the above-mentioned exists.

When the (portable) hydraulic tool is applied, the time for the piston (actuating mechanism) to retreat during operation is greatly shortened, and the (portable) hydraulic tool can be stopped at a certain position, so that the time for the piston to move during next operation is saved, and the operation (such as shearing) efficiency is improved; and the switch piston is closed to automatically retract when the operation is finished, so that the operation efficiency is greatly improved.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a portable hydraulic tool having a housing, characterized in that,

a handle is arranged at one side end of the shell, and one side end of the handle is detachably connected with the battery pack;

the handle is provided with a switch for driving the hydraulic tool,

an actuating mechanism is arranged in the shell and is detachably connected with a working component for operation,

the executing mechanism comprises a first executing mechanism and a second executing mechanism,

a pressure relief valve assembly, and an auxiliary pressure relief assembly matingly coupled to the pressure relief valve assembly for restoring the moving portion of the working assembly to an initial position or an intermediate position in the stroke.

Preferably, the handle is further provided with a lighting unit for auxiliary lighting.

Preferably, the body of the pressure relief valve assembly is cylindrical, and includes a first valve needle, a first spring fitted to the first valve needle, and a valve seat member disposed at one side end of the body, wherein the first valve needle moves in the pressure relief valve assembly, and an overflow hole for blocking or opening the valve seat member is formed through an end portion of the first valve needle. The first valve needle extends beyond the body of the pressure relief valve assembly past the end of the first valve needle to block the spill orifice of the valve seat member. When the pushing force of the medium pressure in the valve seat part to the end part is larger than the elastic force of the first spring to the first valve needle, the first valve needle retracts to open the overflow hole.

Preferably, the end portion of the first needle includes a shoulder portion and a tapered portion disposed on the shoulder portion side.

Preferably, the first needle, the shoulder portion, and the tapered portion disposed on the shoulder portion side are integrally molded.

Preferably, the first valve needle is cylindrical and has a diameter smaller than the diameter of the shoulder.

Preferably, the valve seat assembly further comprises a flow dividing hole which is arranged on the same side as the overflow hole, and a cavity is arranged in the valve seat and is used for being communicated with the cavity of the working area.

Preferably, the auxiliary pressure relief assembly is disposed in the oil tank, and includes a driving portion having an output end, the output end being connected to a second valve needle, the second valve needle being connected to a second spring, one end of the driving portion being mounted in a recess of a fixing portion, the fixing portion being fixed to a side wall of the oil tank, a cavity communicating with the recess being disposed therein, and an inlet and an outlet communicating with the second flow path, the second valve needle being moved based on movement of the output end to block or open the inlet and the outlet.

Preferably, the second flow path communicates with the first flow path through the dividing hole.

Preferably, the driving part is a solenoid valve, and the output end of the solenoid valve is connected with the second valve needle.

For the scheme among the prior art, the utility model discloses an advantage:

by adopting the hydraulic tool of the embodiment of the application, the hydraulic tool can be returned to the initial position or a certain position in a stroke path according to application occasions when the hydraulic tool is applied, and the switch piston is closed to automatically return when the hydraulic tool finishes the operation, so that the operation (such as shearing) efficiency can be improved, and meanwhile, the oil return component of the hydraulic tool is simple and has high reliability.

Drawings

The invention will be further described with reference to the following drawings and examples:

fig. 1 is a schematic perspective view of a hydraulic tool according to an embodiment of the present invention;

fig. 2, fig. 3, fig. 4 and fig. 5 are schematic structural views of the actuator in fig. 1.

Detailed Description

The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present invention. The conditions used in the examples may be further adjusted according to the conditions of the particular manufacturer, and the conditions not specified are generally the conditions in routine experiments.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

The present application provides a portable hydraulic tool, in which an actuator is disposed, the actuator includes a piston disposed in a cavity of a working area, and the hydraulic tool drives a working assembly connected to the piston to move in the cavity during operation. When the tool works, the retraction time of the piston (actuating mechanism) during operation can be greatly shortened, the piston can be stopped at a certain position in the stroke, and the switch piston is closed to automatically retract when the operation is finished, so that the time of moving the piston during next operation is saved, and the operation (such as shearing) efficiency is improved.

A hydraulic tool according to an embodiment of the present invention will be described with reference to fig. 1 to 5. The drawings include schematic drawings, and the scale and the aspect ratio of each component may be different from those of the actual components.

Fig. 1 is a perspective view of a hydraulic tool. The hydraulic tool 200 includes a housing 202 having one end connected to a working unit 201 via an actuator 203, a handle 204 disposed at one end of the housing 202, and a battery pack 206 connected to an end of the handle 204; the handle 204 is provided with a switch 205 for actuating the hydraulic tool. Preferably, the working assembly 201 is detachably connected to the housing 202, and different types of working assemblies can be replaced depending on the application in different places so that the hydraulic tool can be used for shearing, nut breaking and the like. When the cutting machine is operated once, the piston in the actuating mechanism can be stopped at a certain position in the stroke when retreating, so that the time for retreating the piston in the operation process is greatly shortened, and the overall efficiency of operation (such as cutting) is improved. In one embodiment, the handle 204 is further configured with an illumination unit to assist with illumination (e.g., to provide auxiliary illumination during light shading). When the hydraulic tool works, the motor in the hydraulic tool drives the plunger piston to move to pump media (hydraulic oil) into the space 8 from an oil tank (in an oil storage cavity), so that the one-way valve is opened when the pressure in the space 8 rises to a certain hydraulic value, the media flow into the space of the cavity of the working area through the one-way valve to further push the piston in the cavity to move, and the other end (not shown) of the piston is connected with the working assembly to perform operation. After the operation is finished (namely, when the pressure in the space reaches a preset condition (such as a preset value)), the pressure relief valve assembly is triggered to release pressure, so that the medium in the working space flows back to the oil tank (the oil storage cavity), and the piston in the actuating mechanism is restored to the initial position or a certain position in the stroke under the action of the spring connected with the piston. The pressure relief valve assembly includes an auxiliary pressure relief assembly for stopping a piston in an actuator at a certain position in a stroke. The actuator also comprises other structures of the existing hydraulic tool, the application aims to improve the oil return structure in the actuator, and other components can refer to the existing portable hydraulic tool.

The actuator 203 of the hydraulic tool proposed in the present application will be described in detail with reference to fig. 2 to 5, when the actuator is operated, the switch 205 (see fig. 1) is turned on, the motor in the housing 202 operates to drive the plunger to move to pump the medium from the oil tank 4 to the space 8 (channel 8), one side end of the space 8 is provided with the check valve 9, when the pressure of the medium in the space 8 is increased to a certain value, the check valve 9 is opened, so that the medium in the space 8 flows into the cavity 5 of the working area through the check valve 9, the piston 3 in the cavity 5 is pushed to move (advance) due to the pressure of the medium, and the other end (not shown) of the piston 3 is connected to the working assembly 201, and the operation is performed through the working assembly. The first needle 15 of the pressure relief valve assembly 1 is closed by the first spring 11, i.e., the tapered portion 15a of the first needle 15 blocks the spill orifice 16a, so that the medium flowing into the cavity 5 cannot flow through the pipe 10, and flows to the spill orifice 16a and the return orifice 12 of the valve seat member 16 and returns to the tank 4. The piston 3 is connected with a spring 14, and the piston 3 is retracted under the elastic force action of the spring 14 (the thrust caused by the medium in the cavity 5 is reduced and is smaller than the elastic force caused by the spring 14). In this embodiment, the chamber 5 communicates with the duct 10, the valve seat member 16 is partially installed in the duct 10, and a chamber communicating with the overflow hole 16a is provided inside thereof, and the pressure of the medium in the duct 10 is the same as the pressure of the medium in the chamber 5; when the pressure in the chamber 5 reaches the set pressure, the pressure of the medium on the side of the overflow hole 16a on the tapered portion 15a of the first valve needle 15 is greater than the elastic force of the first spring 11 on the first valve needle 15, and the first valve needle 15 moves, so that the medium flows into the first flow path 17 through the overflow hole 16a and flows back into the oil tank 4 through the return hole 12, and at this time, the opening state of the first valve needle 15 is maintained by the thrust action of the flowing medium in the first flow path 17 on the tapered portion 15, until the pressure exerted on the first valve needle 15 by the pressure first spring 11 is greater than the pressure (thrust) of the first flow path 17 on the first valve needle 15, the first valve needle 15 moves (i.e., closes), and the piston 3 stops moving, i.e., the piston retracts to the initial preset. In one embodiment, the end portion of the first needle is provided with a shoulder portion and a tapered portion arranged on the shoulder portion, and when the first needle is opened, the opening state of the first needle 15 is maintained by the thrust action of the fluid medium in the first flow path 17 on the shoulder portion 15b and the tapered portion 15a, until the pressure applied to the first needle 15 by the pressure first spring 11 is greater than the thrust force of the fluid medium on the shoulder portion 15b and the tapered portion 15a in the first flow path 17, the first needle 15 moves (i.e., closes), and the piston 3 stops moving. One side 15c of the shoulder portion 15b faces one side surface 16c of the valve seat member 16.

As shown in fig. 3, when the pressure in the working area cavity 5 of the actuator reaches the set pressure, the pressure relief valve assembly 1 is triggered, and the medium in the working area cavity 5 flows back to the oil tank 4. When the pressure in the cavity 5 reaches the set pressure, the medium on the side of the overflow hole 16a communicated with the cavity pushes the first valve needle 15 to move upwards, the medium flows into the first flow path 17, the medium pushing steel ball 18 flowing into the first flow path 17 moves to seal the hole 19, at this time, the control system triggers the driving part 6, the second valve needle 2 connected with the driving part operates to extend and move (extend and retract) the end part of the second valve needle 2 to block the inlet and outlet hole of the second flow path in response to the trigger signal, the medium only flows back to the oil tank 4 from the first flow path 17 through the return hole 12 until the pressure exerted on the first valve needle 15 by the first spring 11 is larger than the thrust of the medium in the first flow path 17 to the first valve needle 15, the overflow hole 16a is blocked by the tapered part 15a of the first valve needle 15, and the piston 3 stops retracting.

In the process of retracting the piston 3, the switch assembly is actuated again, the control system triggers the driving part 6, the second valve needle 2 connected with the driving part is operated to retract as shown in fig. 5 in response to the trigger signal, part of the medium flows into the second flow path 13 through the diversion hole 16b, and quickly returns to the oil tank 4 through the second flow path 13, so that the pressure of the medium in the first flow path 17 is quickly reduced, the thrust of the medium on the first valve needle 15 is quickly reduced, the valve needle 15 is quickly closed, the piston 3 stops retracting (it is heard at a certain position in the stroke), and the next operation (such as shearing) is performed.

In one embodiment, when the predetermined operation is completed, the switch (see the switch 205 in fig. 1) is released as shown in fig. 4 (after the shearing is completed, the system pressure does not reach the set pressure, the piston does not retract, and when the switch is released, the second valve needle helps the first valve needle to open, so that the automatic pressure relief retraction is achieved), the driving part 6 is triggered, the second valve needle 2 connected with the driving part is acted to extend and move (extend and retract) in response to the trigger signal, hydraulic pressure is generated on the medium in the cavity 7a during the extending and moving of the second valve needle 2, the medium is squeezed into the second flow path 13 and rapidly merged into the first flow path 17 through the diversion hole 16b, so that the medium in the first flow path 17 is acted by the extra hydraulic thrust of the medium in the second flow path 13 (corresponding to the extra pressure exerted when the previous pressure is dynamically balanced), and the thrust of the medium in the first flow path 17 on the first valve needle 15 is larger than the pressure exerted on the first valve needle by the first spring 11 15, the first valve needle 15 moves (moves upwards), the medium in the cavity 5 enters the first flow path 17 through the small hole 16a, the medium flows back to the oil tank 4 from the return hole 12, the piston 3 is pushed to move backwards under the action of the spring 14, so that the operations such as shearing and the like are completed, and the piston 3 automatically retracts only by releasing the switch.

In the above-described embodiments, the predetermined working pressure is referred to as the hydraulic pressure which is built up in the hydraulic medium by the drive of the motor during operation of the hydraulic tool, at which hydraulic pressure the one-way valve is open for medium flow. This hydraulic pressure is formed in a hydraulic chamber from the moving part up to the check valve closing face when the check valve is closed. By lifting the non-return valve from the valve seat by acting on said part of the piston surface, the hydraulic medium can flow out through the valve seat, for example into a hydraulic medium reservoir.

In the above embodiment, if the hydraulic tool is in the process of performing pressing, cutting or punching, for some reason, such as an emergency, the moving part of the working assembly is not only stopped but also retracted after the operating switch is released.

In the hydraulic tool of the embodiment, the actuating mechanism comprises the motor which drives the plunger to move to pump the medium into the space from the oil tank when working, and the one-way valve is opened when the pressure in the space rises to a certain value, so that the medium flows into the space through the one-way valve to further push the piston to advance, and the other end of the piston is connected to the movable mechanism in the working assembly to perform operation. After the operation is finished, the pressure is released through the pressure relief valve assembly, and the medium in the working area space flows back to the oil tank.

In the design of the hydraulic tool, a control module is arranged in the handle or the shell, the control module is preferably electrically connected with the battery pack, the battery pack provides driving electric energy, and the control module is electrically connected with the switch, the motor and the auxiliary pressure relief valve assembly and controls the operation of the auxiliary pressure relief valve assembly based on instructions. The battery pack is mounted to the handle in a pluggable manner.

In the design of the casing, the relief valve assembly 1 is disposed, the relief valve assembly 1 is substantially cylindrical, a first needle (first needle 15) is disposed in the relief valve assembly 1, a first spring 11 is fitted to the first needle 15, the first needle 15 moves in the relief valve assembly 1, a shoulder portion and a tapered portion disposed on the shoulder portion are disposed at an end portion of the first needle 15, the tapered portion blocks a spill hole 16a of a valve seat member 16 by a spring force in a normal state, and the valve seat member 16 has a cavity therein and is connected to the pipe 10. The medium inlet conduit 10, the overflow opening 16a, the first and/or second flow path, the return opening 12 in the working chamber 5 then return to the tank 4. The piston is retracted to a preset initial position or stopped at a certain position of its stroke by the pressure relief valve assembly 1 or the cooperation of the pressure relief valve assembly 1 with an auxiliary pressure relief assembly. Preferably, the first needle 15, the shoulder 15b and the tapered portion 15a are integrally formed.

In the design of the pressure relief valve assembly 1, it includes the auxiliary pressure relief assembly, the auxiliary pressure relief assembly is disposed in the oil tank 4, the auxiliary pressure relief assembly disposes the drive part 6, and the fixed part 7 connected with drive part 6, one end of the drive part 6 is installed in recess 7b of the fixed part 7, it has output end 6a, the output end 6a connects the second valve needle 2, it has second spring 2a that cup joints, one side end of the second spring 2a is fixed to the end of cavity 7a of the fixed part 7, the second valve needle 2 moves in the cavity 7a based on the drive movement (stretch out/retract) of the drive part 6 and moves (retract) based on the elastic force of the second spring 2 a. The fixed portion 7 has a screw 7b disposed at one end thereof for accommodating the driving portion 6, and has the other end attached to a pump body side wall of the fuel tank 4, a cavity 7a disposed therein, the cavity 7a communicating with the recess 7b, and a port 7c disposed on the side of the cavity 7a closer to the pressure relief valve assembly 1, and communicating with the second flow path 13 through the port 7 c. Preferably, the driving part 6 is a solenoid valve, and the output end 6a thereof is connected to the second valve needle 2. The casing of the electromagnetic valve of the driving part 6 is connected with the pump body made of steel materials through a metal fixing part 7 to be used as one pole, and the other pole of the electromagnetic valve is installed on a metal rod with an insulating and sealing layer through a lead, so that the control signal of the battery valve is transmitted. Preferably, the first valve needle is substantially perpendicular to the second valve needle. The solenoid valve is disposed in the oil tank 4.

In the design of the pressure relief valve assembly, the pressure relief valve assembly includes a cylindrical body, a first valve needle is provided in the body, a first spring 11 is fitted around the first valve needle, a first valve needle 15 is moved (moved up and down) in the pressure relief valve assembly 1 by the action of the first spring 11, a shoulder portion having a radial width larger than a radial width (i.e., a diameter) of the first valve needle is provided at one side end of the first valve needle, and the shoulder portion is provided at a tapered portion of the shoulder portion. The tapered portion is telescopically connected to the valve seat member 16 to block the spill orifice 16a of the valve seat member 16. Preferably, the cross section of the overflow hole 16a is flared or tapered to match the tapered portion 15 a. The first valve needle is cylindrical.

In the design of relief valve subassembly, its body is the tube-shape, contains first needle in it, cup joints in the first spring of first needle, disposes in the valve seat part of a side of body, first needle removes in the relief valve subassembly, through the tip of first needle is in order to plug up or open the overflow hole of valve seat part. The first valve needle extends beyond the body of the pressure relief valve assembly past the end of the first valve needle to block the spill orifice of the valve seat member. When the pushing force of the medium pressure in the valve seat part to the end part is larger than the elastic force of the first spring to the first valve needle, the first valve needle retracts to open the overflow hole.

In the design of the pressure relief valve assembly 1, in the normal operation mode (first mode), when the piston of the actuator included therein is retracted, the medium in the working area chamber 5 flows through the conduit 10 and the spill orifice 16a of the valve seat member 16, then flows through the first flow path 17 to the return orifice 12, and then flows back to the tank 4 (at this time, the end of the second needle blocks the entrance/exit of the second flow path, and the medium cannot flow in the second flow path).

When the hydraulic tool works, when the system pressure in the working area cavity reaches a set value, the current of the driving motor suddenly drops to trigger the auxiliary pressure relief assembly to be closed, and if a user opens the switch of the tool, the auxiliary pressure relief assembly is opened. The tool switch is closed and the auxiliary pressure relief assembly is closed (where closed, a time delay is set in the control system, the time delay is determined by the time the piston 3 bottoms out), and the tool switch does not control the pressure relief valve assembly 1 to open alone. Opening of the pressure relief valve assembly 1 for extended periods requires closing of the auxiliary pressure relief assembly.

The hydraulic tool is provided with a shell, a handle is arranged at one side end of the shell, and a battery pack is detachably connected to one side end of the handle; the handle is provided with a switch for driving the hydraulic tool, the shell is internally provided with an actuating mechanism which is detachably connected with a working assembly for operation, and the actuating mechanism comprises a pressure relief valve assembly and an auxiliary pressure relief assembly which is matched and connected with the pressure relief valve assembly and is used for restoring a moving part of the working assembly to an initial position or a middle position in a stroke. The hydraulic tool has the advantages that the working efficiency of the hydraulic tool is improved, the retraction time of a piston (an actuating mechanism) during working can be greatly shortened during application, the hydraulic tool can be stopped at a certain position in a stroke, the switch piston is closed to automatically retract when the working is finished, and therefore the time for moving the piston during next working is saved, and the working (such as shearing) efficiency is improved.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A portable hydraulic tool having a housing, characterized in that,

the handle is provided with a switch for driving the hydraulic tool,

an actuating mechanism is arranged in the shell and is detachably connected with a working component for operation, the actuating mechanism comprises,

2. The portable hydraulic tool of claim 1,

and the handle is also provided with a lighting unit for auxiliary lighting.

3. The portable hydraulic tool of claim 1, wherein the pressure relief valve assembly has a cylindrical body, a first valve needle, a first spring fitted around the first valve needle, and a valve seat member disposed at one side end of the body, wherein the first valve needle moves in the pressure relief valve assembly to close or open a spill orifice of the valve seat member through an end portion of the first valve needle.

4. The portable hydraulic tool of claim 3, wherein the end portion of the first valve needle includes a shoulder and a taper disposed on one side of the shoulder.

5. The portable hydraulic tool of claim 4, wherein the first needle, the shoulder and the tapered portion disposed on the shoulder side are integrally formed.

6. A portable hydraulic tool as in claim 5 wherein the first valve needle is cylindrical with a diameter less than the diameter of the shoulder.

7. A portable hydraulic tool as in claim 3 wherein the valve seat member further comprises a bleed orifice disposed on the same side as the spill orifice, the valve seat having a cavity disposed therein for communicating with the working area cavity.

8. The portable hydraulic tool of claim 1, wherein the auxiliary pressure relief assembly is disposed in a tank and includes a drive portion having an output end, the output end being connected to a second valve needle, the second valve needle being connected to a second spring, one end of the drive portion being mounted in a recess of a fixed portion, the fixed portion being fixed to a side wall of the tank and having a cavity therein communicating with the recess, an inlet and an outlet communicating with a second flow path, the second valve needle being moved to block or open the inlet and the outlet based on movement of the output end.

9. The portable hydraulic tool of claim 8, wherein the second flow path communicates with the first flow path through a flow dividing orifice.

10. The portable hydraulic tool of claim 8, wherein the drive portion comprises a solenoid valve having an output connected to the second valve needle.